. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. 262 The Alders 3. OREGON ALDER —Alnus rubra Bongard Alnus oregona Nuttall The Oregon alder is a tall forest tree, attaining a maximum height of about 28 meters and a trunk diameter of a meter or more. It inhabits the vicinity of the Pacific coast, extending from California to Alaska, preferring moist soil. The bark is nearly smooth, light gray or whitish. The young twigs are finely velvety and green, becoming smooth, redd
. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. 262 The Alders 3. OREGON ALDER —Alnus rubra Bongard Alnus oregona Nuttall The Oregon alder is a tall forest tree, attaining a maximum height of about 28 meters and a trunk diameter of a meter or more. It inhabits the vicinity of the Pacific coast, extending from California to Alaska, preferring moist soil. The bark is nearly smooth, light gray or whitish. The young twigs are finely velvety and green, becoming smooth, reddish, and gray. The somewhat hairy buds are 6 to 8 mm. long. The leaves are ovate or oval, pointed or bluntish, rather firm in texture, prominently straight- veined, usually from 6 to 12 cm. long, but sometimes larger, coarsely toothed with the teeth again dentate; when fully grown they are smooth and dark green on the upper surface, brown-hairy, particularly along the orange-colored veins beneath, but some- times only slightly so; the leaf-stalks are stout, orange yellow, i to 2 cm. long; the small ovate pointed stipules fall early in the season. The catkins of staminate flowers are i to dm. long at the time of flower- ing in early spring, before the leaves unfold; the calyx of the staminate flower is 4-lobed and there are 4 stamens with anthers about as long as the filaments. The ripe pistillate catkins are cm. long or less, their scales thickened at the apex. The nut is mm. long, bordered by a thin wing of only about one third its width. The wood is weak, brittle, Ught reddish brown, and takes a good polish; the specific gravity is about ; it is used in large amounts on the Pacific coast for furniture, and in Alaska is made into canoes by the Fig. 220. — Oregon Alder. 4. THIN-LEAVED ALDER — Alnus tenuifolia Nuttall While usually a shrub, this species sometimes becomes a tree 8 to 10 meters high, with a trunk about 2 dm. thick. It occurs along s
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